MB. ST. GrEOBGrE MXYAET ON THE SKELETON OE THE PEIMATES. 
SOI 
Specimens have been examined of all the above genera except Propithecus, Hapa- 
lemur, Microcebus, and Lepilemur, no skeleton belonging to any of these genera 
existing, to my knowledge, in this country. There is, however, every reason to believe 
that the skeleton of Propithecus closely resembles that of Indris, and the other three 
are probably very similar to Lemur or Galago. 
The Pectoral Limb. 
The entire pectoral limb (measured from the summit of the head of the humerus to 
the distal end of the longest digit) attains its greatest absolute length in the Gorilla 
and Orang, after which come the Chimpanzee and Man. If the manus, however, be 
excluded, the rest of the limb of Man exceeds that of the Chimpanzee in the speci- 
mens examined. 
The proportion borne by the entire limb to the spine, measured as before mentioned, 
is greatest in Hylobates, namely, as much as about 203, or even 222, to 100. Next 
come Tarsius, in which it is about 187 to 100; Ateles, 174; Simia, 170; the Gorilla, 
150 ; and the Chimpanzee, 142 *. The rest range from 128 (Cheiromys) to a little less 
than the spine in length (Man being about 107 to 100), except certain forms in which 
the proportion is much less; thus in Chrysothrix and Hapale it is less than 85 to 100, 
while in Perodicticus and Lemur it is under 80, and in Arctocebus as little as 75*3 
to 100. 
The length of the limb without the manus, compared with that of the spine, is again 
by far greatest in Hylobates, then in Tarsius, Ateles, Simia, and the Gorilla ; in all the 
rest, except the Chimpanzee, the pectoral limb without the manus is shorter than the 
spine, and shortest of all in Perodicticus. 
Scapula. 
This bone throughout the Order has a well-developed spine, and more or less large 
acromion and coracoid processes. 
Estimating its size by a line drawn from the anterior (in Man upper) end of the gle- 
noid surface to the posterior (in Man inferior) vertebral angle, this bone is seen to attain 
its greatest absolute size in the Gorilla. Man follows next, with the Chimpanzee and 
Orang, which two Apes more nearly equal him in the size of this bone than he does 
the Gorilla. 
This dimension, compared with the length of the vertebral column, is again greatest 
in the Gorilla, namely, about 35*5 to 100 ; then in the Orang and Chimpanzee about 
30, and in the Gibbons and Ateles about 25. In Man it is about as 22-8 to 100, and in 
most of the other forms it is less, and least in Perodicticus, namely about 15 -6. 
* Dr. Ll'cae, loc, cit. p. makes the proportional length of the limb greater in the Chimpanzee than in 
the Gorilla, as also does Dr. G. M. Httmthby (Human Skeleton, p. 106). In all the adult, or nearly adult 
specimens in the Museum of the Eoyal College of Surgeons I find the pectoral limb longer compared Tvith the 
spine in the Gorilla than in the Chimpanzee. 
